What was found
DURING CLIMB OF THE AIRCRAFT AS FLIGHT LR-604 FROM SJO TO LAX, THE PILOT IN COMMAND REPORTED: DURING CLIMB WEATHER RADAR STOPPED AT LEAST 4 TIMES, ALL RADAR INDICATIONS DISAPPEARED; SO THE AIRCRAFT WAS RETURNED TO SJO AIRPORT PERFORMING AN OVERWEIGHT LANDING PROCEDURE (71,000 KG.) IT WAS INSPECTED AS PER TSM 34-41-00-810-801-A AND 34-41-00-810-812-A, THE WXR TRANSCEIVER WAS REPLACED IN ACCORDANCE WITH AMM 34-41-33 PB 401 AND THE WEATHER RADAR CONTROL UNIT WAS REPLACED IN ACCORDANCE WITH AMM 34-41-12 PB 401, PERFORMED OPERATIONAL TEST IN ACCORDANCE WITH AMM 34-41-00-740-002-A WITH NORMAL RESULTS. THE AIRCRAFT WAS RETURNED TO SERVICE.